As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - 'SMOKE' CAPTION ILLUMINATED DURING AIRCRAFT TAXI OUT FOR TAKEOFF. AIRCRAFT RETURNED TO GATE. MAINTENANCE REPLACED BAGGAGE COMPARTMENT SMOKE DETECTOR. SMOKE DETECTION SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)